As the manhunt continued into a third day, Scotland Yard appealed for Abdul Ezedi to hand himself in.
He is believed to have driven from his home in Newcastle to London early on Wednesday morning carrying chemicals he would use on his alleged victims hours later.
Addressing the suspect directly via broadcasters yesterday, the Met police commander Jon Savell said: "Abdul, you clearly have got some fairly significant injuries. We've seen the images, you need some medical help. So do the right thing and hand yourself in."
Detectives said the mother remained under sedation after suffering "life-changing injuries", but her children are not thought not to be in as perilous a position as first feared.
The incident took place at about 7.30pm on Wednesday in Clapham, south London. CCTV footage showed a man running around a car before getting into the driver's seat, with a woman and child in front of the vehicle holding their hands to their faces.
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